Op  philadelphia



@uiten "tutes nient` fitte.

THOMAS s. nissromor' rrnntoutrnlrt, PENNSYLVANIA, Assis-Neuro HENRY nissron, or SAME PLAGE.

Eetters .Patent No. 73,880, dated January 28, 1868 inrnovnnnnr nr sinfen'nunienicurnn TO ALL WHGM IT MAY OONCERN:

Be it known that I,.TH.0MAS S. DISSTON, of Philadelphia, Pennsylvania, have invented un improved Saw- Grumming Machine; and I do hereby declare' the following to he a full, clear, nnd'exuct description ofthe sume.l

.My invention oonsiets of certuin mechanism, fully described herenfter, for rapidly and accurately cutting the iront-s of sow-teeth.

in order to enable others familiar with machinery of this class to mane und use my invention, I will now proceed to deseribedts construction and operation, reference being had to theiuecompanying drawing, which forms u part of this specification, und in which- I f Figure l ist, sectional elevation of my improved sowgumming machine, showing the same applied to a circular suiv..

Figure 2, e side elevation.

Figure 3, u transverse sectional View on the line L2, iig. l.

Figure 4, e sectional plan View on the line 3-4, fig. l, und

Figure 5 a. plan view. v

Similar letters refer to similar parte throughout the several views.

The enseen-frame A of-themoehiuerensiste ottwoend perts,eeutd` .cezinectcd together bgmtud forming u. part of the curved guides 5 r3-end l5 b,'in which n frame, B, is wronged to `slide, ce shown iu the drawing, end in each of the guides are formed two recesses or grooves t for n purpose described hereafter, (see iigs. 1 und A feed-serein C, provided with' jam-nuts d d and u. hund-wheel, d', passes through the rear'end of the freine A, and the inner end of the scid screw beurs against o. spring, g, und is so attached to the sliding frame B that the letter is caused to travel hack or forth on the guides 6 und b' when the hand-wheel d is turned. A horizontal spindle, D, posses through and turns in the sliding frame E, und has :it each end e crank-handle, und n pinion., e', upon the said spindle, genre into n cog-weeehj, on o spindle, E, which also turns in the sliding frame. lOwing to thc iiarnges or shrouclsion the cog-wheel j, the letter always remains in gea-r with the pinion, but both spindles D and iil can be moved'longitudinully in their bearings fore purpose described hereafter, and to the lutter spindle, und. withiri the frame B, is secured o cutter-wheel, F. An adjustable guide-hor, G, having n slot, Z, is attached to the upper inclined portion of the frame A by u nut, m, upon n. set-screw, m, the lutter, together with other set-screws rr, entering u narrow longitudinal groove, p, formed in the under part ot' the .Vrnme A, for a. purpose described hereafter.

Thefpoints of the teeth of a. circular suiv are generally sharpened by hand with un ordinnryle.' When this hos been repented several times, it becomes necessary, in order to impart proper shape to the tooth, to out envoy the semicirculur front of the sume-on operation which my improved suiv-gommer is designed to perform. In the portion of c sew, X, shown in red lines, fig. 1, but three teeth are represented, y,y, und y2, in cutting which the tooth y is the first operetedon, after which it will be necessary to cut euch tooth il succession, movin-g'the.

instrument urennd the sow in the direction of the arrow 1. The sliding frame B and cutter F are moved towards` the rear end oflthe frame A by operating the hund-wheel d, and the machine is then applied to the saw-.blade X. The lutter enters the groeve p, und the machine is raised or icrrered on the snw by operating the set-scrcW m" until the cutterhii is brought in contact with theieemicirculer vportion of the tooth y, after which -thesetscrews i* are turnedfand the much-ine firmly secured to the surf. A

The next operation is to rotate the cutter-wheel F, towhic'n motion 'is communicated, through the gearing described, hy turningt'ne handles h i. At the some time the cutter is fed up against the front ci' the tooth by' turning the screw-rod C, and this is continuedvuntil the tooth lgfhus been cut to the desired depth. The next stage o? the operation is to stop themotion ot' the cutter-wheeh'inul to n'zove up the jam-nuts el until they nre in contact with thc rear ofthe frume A, which will effectunlly stop-all i'ovwerd motion of the screw or cutter-wheel beyond this point in operating on other teeth. 'The lengtlnof the on the teeth y having been now determined, the

screw-rod, its juin-nuts, und the slidingfrume, ure'm-ovevdhnch. In iig. l, the tooth y is supposed to have been v thus cut nwny from the point shown by the dotted line 'refund it will be seen that the jam-nuts d, on the screwrod, have been moved buck from 'the rear of the frame A, to a distance equal to the depth of this cut. The seti l A l 7a,seo

screws r are new loosened', and the machine'moved until its cutter-wheel is 'brought in contact withthe inner portionA of tl etooth 'yhin whichposition it is secured, as befdre described. The guide-bar G 'is then adjustedl ustltits out: r .end bears against the sharpened tooth y,'\`v'ben it is'secured by its nut, m, as shown in g. l.

V 'The ma'rliineis now operated as beforehand the tooth 'y1 cut-away until the forward motion ofthe cutteris arrested by the jam-nutsd-coming in contactvwith the rearl of the frame. The sliding frame is then drawn hack, the machine remoid, andhpplied to the third tooth y, the guide-bar'G bearing against the tooth'- y, and deter,-

.'mining the p'rition of the frame'LA. on'the saw. 'Ehe tooth y* is cut in .the same manner as the preceding o nes,

and the opt-nation is repeated on each tooth of the saw until they havel all been eut, when the macliinetis remoyed.. and the points of the" teeth are dressed to the proper degree of sharpness with an ordinary lc, or' otherwise. llt will be seen that the guide-bar-G serves, with a cnt tooth, as a gauge to determine the .proper Avposition of the machine in adjusting the same for operating accurately onanother tooth. The spring g, against l which t'ie feed-screw bearswhenpushing up the sliding frame, acts as a cushion, and' prevents any tendency which t' .e cutter might v have to become jammed against the tooth when pushed up suddenly. I The face. of the cutter-u hee? F is considerably wider than the edge of the saw, so that as the former becomes dull it may b'e moved ltterally,'the arrangement of the'spindles, as before described, permitting such ndjustmentg It will be eeen, on reference to tig; 3, that, after the removal of the handle h and cog-wheolj, the frame B, when brought to a pos ition'opposite the recesses t of the guides 57, may be moved-laterally, and detached from the frame of the machine.- l[t will also -b`e seen, on reference to fig. 1, that thecurve ofthe guides b' and b' approximates in form to that of the curve .of the saw, and that the sliding frame'and cutter-wheel mustnecessarily follow tho same curve. y v

I claim as ray-invention, and desire to secure by Letters Patentl u 1. llie'frame A, with its curved guides, b and ll', in combination with the adjustable frame B and its cutter F sliding on. the said guides, and carrying a cutter, F. i l

2, The adjustable. guide-bar G, combined with the frame of v the machine, substantially as and for the pui pose specified. i k

3 The jam-nut Aor nuts d. in combination with the' screw C, for adjusting the frame B, substantialIyns described.

4. The :recesses t t on the guides 4b of the frame A, constructed as described, when `the said recesses are:

arran ed in respect-to the sliding frame B, for the admission ot thelatterto and its withdrawal from the said fram'e A,"iisl set forth. n

- In testimony whereof, I have signed my name to'this-s'pecication in the presence of two subscribing witnesses.

' THOMAS s. DIs'sToN.

liritnesses:

"CHARLES E. FOSTER',

W. J. R. DELANY. 

